<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<form action="/request-demo/req4" method="post">
<input type="text" name="username"><br>
<input type="password" name="password"><br>
    <input type="checkbox" name="hobby" value="1">游泳
    <input type="checkbox" name="hobby" value="2">爬山
<input type="submit">
</form>

</body>
</html>